A method of forming a nodular insulation material suitable for installation in a cavity, comprising: propelling fibrous nodules at a substrate, wherein the fibrous nodules are formed from inorganic fibers, wherein the majority of the nodules have a maximum dimension of about one-half inch, and contacting the nodules while the nodules are being propelled, with a solution comprising water and a water soluble binder to produce coated nodules, wherein the coated nodules form an insulation on the substrate.